Creping paper



Patented Apr. 21, 1925.

UNITED STATES v 1,534,482 PATENT OFFICE.

EDWARD H. ANGIER, OF FRAMINGHAM, MASSACHUSETTS.

GREPING PAPER.

Application filed June 21, 1921. Serial No. 479,405.

Improvement in Crping Paper, of which the following description, in connection with the accompanying drawings, isa specificadoctor blade 7 which crow back upon itself and 'crpes it,'the moist ,crped stock passing to a drier, not shown,

tion, like characters on the drawings representing like parts.

This invention relates to the production of 'crped or crinkled paper and the object is to provide a method and mechanism whereby crinkled paper of superior quality may beeffectively produced.

My invention will best be understood by reference to the following description of specific embodiments thereof shown by way of example in the accompanying drawings, wherein:

Fig. 1 is'a diagrammatic view of a crepin machine; and

ig. 2 is a similar view of a modification.

My invention may be practiced by a suitable arrangement of creping mechanism which generically is of the well known roll and doctor type wherein a moist web is caused to adhere to a suitable supporting surface, usually. a smooth surfaced roll '5' known as the vcrping roll, and. removed therefrom by a blunt ed d abutment or the moist stock where it is dried and the crinkles made permanent. Referring to Fig. 1, I have there shown a machine of this type adapted to operate on suitablefinished paper and embodying a saturating tank 9 and a stack of rolls which may include a. roll 11 rotating in the bath in the tank 9, the crping roll 5 above the roll 11 and a'soft surfaced squeeze roll 13 pressing down on the crping roll 5. A

.web of paper a may be led from a supply 15 oversuitable guiding means 17 in the bath to, the lower surface of the roll 11, passes around the sameand between the roll 11 and the crping roll 5, around the crping roll the moist web a to the crping roll 5 by a I relatively impermeable overlying layer and plied thereto through such an impermeable layer. This layer may, according to one embodiment of the invention, be of what is known as duplex paper, that is, a water proof paper product consisting of two thicknesses of aper united by an intervening waterproo g adhesive which is preferably what is known as black asphalt, that is, the pitchy residue of oil distillation.

In the example of my invention shown in Fig. 1 I have graphically illustrated the use of a duplex web by showing such a web as if manufactured as utilized in the crpingoperation, a proceeding possible although by no means necessary. Thus, referring to the drawings, I have shown a supply roll 21 from which the paper web I) is led over coating roll 23 which coats one side of it with roll 27 is superposed thereon and the two are web 60 consisting of the two separate webs of paper b and 0 united by the intervening layer of asphalt and forming a substantially impermeable compound web. a The duplex web 60 ma be led to the saturating bath 9 oversuita 1e guide means 17 therein which are preferably so arranged that the web 60 will be separate from the web a through a part of its passage through the bath. The web 60 is then led to the roll 11 in such a manner that it will overlie the Web a on the crping roll 5 and be interposed between the web a and the squeeze roll 13. Thus in the form of the machine shown it lies inside the web a on the roll 11 and outside the same on the crping roll'5. The duplex web be, which is softened in the bath, is crped by the doctor 7 together with and simultaneously with the weba and may pass therefrom to the drier and there be dried, the product then being the crped web a and a crped duplex web 60, the crped duplex paper being in itself 'a desirable article of manufacture.

a It has been demonstrated empirically that when a web of paper is thus crped after 'firmly pressed together to form the duplex being pressed, against the crping roll by .an overlying'web of'duplex paper that the characteristics of the resultant crped material is markedly different from those which result when paper is crped alone in the usual manner. The crepings or crink lings are much sharper and more clean cut. The reason for this is necessarily a matter involving a certain amount of speculation and I do not wish to be bound to any particular theory of operation. I shall, however, state what appears to be the probable cause of this result.

The crping action depends upon the proper conditioning of the stock in the bath 9 and its adherence to the creping roll 5 in such manner that it will not be merely stripped therefrom by the doctor blade 7 but crowded back upon itself and crped. Thus, to increase the adherence of the web to the erping roll it is not unusual to employ sizing in the bath 9. The squeeze roll 13 squeezes out the excess moisture and presses the moist stock into close adherence with the roll 5. If adhesive is used the stock tacks to the roll effectively particularly when the latter is steam heated as herein indi-' of the web. Whether this theory of action is correct or no, as I have stated it is practically demonstrated that the crping effect on the web 01 is markedly different from that which would be effected were the im-.

permeable overlying layer absent.

In Fig. 1 I have described the impermeable layer as consisting of a waterproof or duplex paper which is creped together with the web a and utilized itself as a product of the machine. Obviously other impermeable materials might be used and also, whether such other mate-rials, as for example sheet rubber, or waterproof papers are utilized, they may within thescope of my invention be applied otherwise than as in the modification illustrated in Fig. 1 wherein there is used an impermeable web of the same extent of area as the web a to be crped. Thus, referring to Fig. 2, I show the creping of the web a in connection with an impermeable layer 29 in the form of an endless belt, part of which leads in an S-like form around the roll 11 and the crping roll 5 in such manner as to overlie the moist stock on the latter. After the same has passed the doctor it is led upwardly over suitable guide rolls 31 and back to the front side of the roll The form of the invention shown in Fig.

1 also serves as a partial illustration of the invention particularly described and claimed in my copending application Serial No. 479,404, filed June 21, 1921.

Having thus described in detail the particular embodiments of my invention shown by way of example in the accompanying drawings, what I claim as new and desire to secure by Letters Patent I shall express in the following claims.

Claims.

1. The method of crping paper comprising depositing moist stock on a smooth surfaced roll, depositing a separate impermeable band over the stock, pressing both into close adherencewith the roll and crowding the stock back on itself while adhering to said roll.

2. The method of crping paper compris- I ing depositing moist stock on a smooth surfaced roll, depositing a moist duplex waterproof stock thereover, pressing both into close adherence with the roll and crowding them back on themselves while adhering to said roll.

3. The method of crping a moist web with a doctor characterized by superposing a duplex waterproof web on another web on the stock supporting surface.

4. The method of crping a moist web with a doctor characterized by operating on a plurality of webs disconnected throughout their width the outer of which is impermeable.

5. The method of crping a moist web with a doctor characterized by confining the moist stock to be crped to the stock supporting surface by an independent overlying impermeable layer.

6. The method of crping paper by roll and doctor characterized by pressing moist stock to the roll under an independent overlying impermeable band. 7. The method of crping paper by roll and doctor characterized by circulating an impermeable belt over the roll to confine moist stock thereto.

8. Crping mechanism comprising a supporting surface for moist stock, a cooperating abutment for stripping the stock from the surface and an impermeable layer separate from and disconnected from the stock to confine the stock to the surface.

9. Crping mechanism comprising a supporting surface for moist stock, a cooperating abutment for stripping the stock from the surface, means for pressing the stock against such surface and an impermeable confining layer separate from and disconnected from the stock through which the pressure is exerted on the stock. 7

10. Groping mechanism comprising paper saturating means, a creping roll and its doctor, a. cooperating squeeze roll and an independent impermeable layer overlying stack of rolls, a doctor cooperating with an 25 intermediate roll, and an independentimcomprising a 5 permeable strip trained in the path'of the stock through said stack to. confine the stock to said intermediate rollr,

14. Crping mechanism comprising a creping roll, a doctor cooperating therewith and an impermeable circulating belt having a portion overlying an extended are off said roll which terminates adjacent the doctor to confined stock thereto. 7 a

15 'The method of crping a moist web with a doctor characterized by simultaneously operating on a lurality of disconnected, independent we s the outer one of which-is of material to retain the inner one ifn .close adherence with a supporting sur ace.

16. The "method of crping a moist Web with a doctor characterized by confiningthe moist stock to be crped to the stock supporting surface by a separateydisconnected overlying layer. p w

In testimony whereof, I have signed myv name tothis specificationr v EDWARD H ANGIER, 

